Sample Logos for a Database Management System

Our company is developing a database management system for an eye clinic. I have come up with various designs that I hope will represent the software. Attached are samples of the logo that I have designed. I would like to get your opinions on what you think of them.

The one at the bottom looks most promising to me. Perhaps consider styling C into an iris .. though it may come out cheesy. I would certainly drop the reflection and use same, sans serif type for both lines. Also the bottom line is kerned way too tight and it looks discomforting. Also 3 shades of blue in the way you have them is a one too many.